Perfluoro phosphates



United States Patent 015cc 3,412,181 Patented Nov. 19, 1968 3,412,181 PERFLUORO PHOSPHATES Robert A. Braun, Newark, Del., assignor to E. I. du Pont de Nemours and Company, Wilmington, Del., a corporation of Delaware No Drawing. Filed Apr. 9, 1965, Ser. No. 447,088 3 Claims. (Cl. 260-955) ABSTRACT OF THE DISCLOSURE Phosphate esters of the formula where R can be substituted and unsubstituted aliphatic hydrocarbon radicals or substituted and unsubstituted phenyl radicals, and

X and Y are perfiuoroalkyl radicals, useful as wetting agents, high temperature lubricants and anti-fouling additives for gasoline and motor oil.

This invention relates to phosphate esters substituted with perfluoroalkyl groups. It is more particularly directed to compounds having the formula where R can be an aliphatic hydrocarbon radical of 1 through 18 carbon atoms, a phenyl radical, or an aliphatic hydrocarbon radical of 1 through 18 carbon atoms or phenyl radical substituted with alkyl of 1 through 5 carbon atoms, alkoxy of 1 through 5 carbon atoms, cyano, chloro, bromo, or fiuoro and X and Y are the same or different and can be perfiuoroalkyl radicals of 1 through 5 carbon atoms.

where R, X and Y are defined as in Formula 1.

The reaction is carried out in an open vessel or in a bomb, at autogeneous pressure, at temperatures of from The hydrogen phosphite reactants are either available commercially or can be prepared according to the method disclosed in G, M, Ko-falapofit, Organophosphorus Compounds, pp. 196-199, John Wiley, New York, 1950. The ketone reactants are also available commercially, or can be prepared necording to the method disclosed in US. Patent 2,853,524.

0 C. to 150 C. Stoichiometric quantities of reactants are used and no solvent is required. The reaction is quite rapid and is ordinarily complete in from 2 to 6 hours.

The product is recovered from the reaction mass by stripping off excess ketone reactant, if any, under vacuum or by warming the mass. The remaining liquid is a substantially pure compound of the invention, which can, if desired, be further purified by fractional distillation.

The following representative examples are given so that the invention may be more easily understood and readily practiced. Those compounds not specifically shown can be prepared by the same general methods described, by making appropriate reactant substitutions where necessary.A1l parts are by weight.

Example 1 Hexafiuoroacetone parts, 0.6 mole) was added to dimethyl hydrogen phosphite (66 parts, 0.6 mole) at 20 C. The mixture was warmed to and held to 25 C. for 2 hours and then at 50 C. for two additional hours. The resulting liquid was then brought to room temperature and fractionated to give 121 parts of a compound having the formula The compound had a boiling point of 168 C. at 760 mm. of pressure and a refractive index n 1.3279.

Analysis.Calcd for C5H7F6PO4I C, 21.75; H, 2.56; Fl, 41.29; P, 11.22. Found: C, 22.31; H, 2.57; Fl, 41.35; P, 11.34.

A drop of this compound completely wetted a surface of Tefion TFE-fiuoro-carbon resin when applied to it, as contrasted with a drop of ordinary lubricating oil, which beaded.

The compound was heated for 48 hours at its boiling point without any observable color change or decomposition.

Example 2 Hexafluoroacetone (66 parts, 0.4 mole) and diphenyl hydrogen phosphite (468 parts, 0.2 mole) were heated at 150 C. for 8 hours in a stainless steel bomb. The re sulting liquid product, 91 parts, was then fractionated to give 66.6 parts of a liquid having a boiling point of C. at 1.75 mm. of pressure.

This liquid crystallized on standing at room temperature. The resulting solid, having the formula had a melting point of 35-36 C.

Analysis.Calcd for C15H11F6PO4: C, H, F, 28.49; P, 7.74. Found: C, 45.37; H, 3.01; F. 29.18; P, 7.63.

Example 3 ties of the following listed phosphites, to obtain the A mixture of di-(2-ethylhexyl)hydrogen phosphite correspondmg products:

(153.2 parts, 0.5 mole) and hexafiuoroacetone ('83 parts,

0.5 mole) was heated at 50 C. for 6 hours in a bomb. r Phosphite Amount Product The resulting liquid, 249 parts, was then stripped under 9 H 293 018311 vacuum to remove excess ketone reactant, to give 227 (n.C H -,Q): P H parts of residue which was substantially pure di-(Z-ethyl- (1:41 hexyl) hexafiuoropropyl phosphate having the formula OF; CzH 10 CnsHa'! CHQCHCHzCHgCHzCHa (I? 99 z z a I (IFS omoomomo -r-rl I or. O=POCH (I) 0F. 10 F, CHqGH-CHiCHiCHiCH; (IJmCHZOCHx 70 omomoN The product was a viscous oil having a refractive index (NC-GHz-CHz-OhB-H CF; 11 1.4065. o=r *-o-orr Analysis.Calcd for C H F PO C, 48.30; H, 7.47; 5

P, 6.56; F, 24.13. Found: C, 48.19; H, 7.32; F, 24.77; P, 6.52. JH2CH2CN In the preceding examples, one can use the indicated quantities of the following listed ketones in place of hexa- 25 l? 5 CHZCHZCI fluoroacetone to obtain the corresponding compounds (CPCHZCHPO)? H I the invention. O==P-O--CH a Ketone Amount Product HZCHaCl 0 10s 0211. orig-02F. omonomomomom f z 33 53 2 the formula 0 CF: O=1' O J-. H 35 0113 cm 5 (1.11. omonomomomom 2. A compound of the formula 0 183 01115 CzF7( 3-C3F7 omcliomoHioHicH,

O CaF'! 1 0=1 O-(lJH 0 cm omofiomomomom 51115 J) (IJF G 133 021 15 CzFs CIFB CHzCHCHzCH:CH2 8 1 1 N 3. A compound of the formula (I) 02F 00 C211: CHCHCHIOH'GHICH' omoHomomomcm 02H CFa O 283 02115 O: O H ama gam omonomomomom F I onicnomcmomom 0=1 -0-Z-H 1H5 E Z CH CH References Cited (IhHs UNITED STATES PATENTS 2,929,759 3/1960 Gilbert et a1 260970 Similarly, in place of the phosphite reactants used in the preceding examples, one can use the indicated quanti- CHARLES B. PARKER, Primary Examiner.

A. H. SUTTO, Assistant Examiner. 

